Figure 1.

Phylogeny of Tropheini with previous sex chromosome calls and proposed sex chromosome systems. Some systems feature chromosomal fusions or multiple sex chromosomes. Cells in blue indicate an XY system, cells in orange indicate a ZW system. Bolded text indicates disagreement between previous call and current call. Black circles indicate loss of sex chromosome common to that clade. Topology adapted from Ronco et al.⁴⁴ and approximate time scale is from Singh et al.⁴⁸.